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United States Patent | 5,051,032 |
Bessho ,   et al. | September 24, 1991 |
A shield excavator excavates a shaft. Then, the excavator is caused to swing to change its posture and excavate a tunnel. Thus, the shaft and the tunnel is continuously excavated by the single machine.
Inventors: | Bessho; Toshihiko (Tokyo, JP); Ino; Toshimi (Higashikurume, JP); Kaneko; Kenichi (Kokubunji, JP); Uehara; Toshiaki (Yachiyo, JP); Ito; Hiroyuki (Kuwana, JP) |
Assignee: | Taisei Corporation (Tokyo, JP); Ishikawajima-Harima Jukogyo Kabushiki Kaisha (Tokyo, JP) |
Appl. No.: | 580273 |
Filed: | September 10, 1990 |
Dec 13, 1989[JP] | 1-323076 | |
Dec 20, 1989[JP] | 1-330346 |
Current U.S. Class: | 405/141; 299/31; 405/138 |
Intern'l Class: | F21D 009/06 |
Field of Search: | 405/141,138,133,143 299/31,33 175/53,61,79 |
3169796 | Feb., 1965 | Long et al. | 299/31. |
3604754 | Sep., 1971 | Hosel et al. | 299/31. |
3830338 | Aug., 1974 | Svensson | 405/141. |
3958649 | May., 1976 | Bull et al. | 175/61. |
4571122 | Feb., 1986 | Yamamoto et al. | 405/143. |
Foreign Patent Documents | |||
3419731 | Nov., 1985 | DE | 405/141. |
60-164597 | Aug., 1985 | JP. | |
60-184196 | Sep., 1985 | JP. | |
274791 | Mar., 1990 | JP. |